If your edge trimmer is broken or not running properly, the best thing to do is isolate the problem in one of these three areas. There may be a number of small parts within each of these three systems, but isolating the general area will save time as well as allow you to figure out which part is malfunctioning. If you own an older machine you might need to repair more than one part.

Always consider whether it makes more sense to fix your edge trimmer or buy a new machine.